Talk:Materials for use in vacuum

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Materials

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PEEK is another fluoropolymer that is very suitable for high-temperature/ high-vacuum applications. Referencing trade names would make plastics identification easier, especially for PTFE (Teflon). Also, Kapton is commonly used in high vacuum.

Does anyone know if ABS (http://en.wikipedia.org/wiki/Acrylonitrile_butadiene_styrene) plastic is suited for vacuum applications? — Preceding unsigned comment added by 134.94.244.204 (talk) 08:19, 20 October 2014 (UTC)[reply]

ABS was tested by GSC in 2014, report GSC35106 for outgassing. The result was acceptable TML=0.75%, RML=0.50%, CVCM=0.01% 83.163.240.166 (talk) 18:02, 7 January 2016 (UTC)[reply]

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Materials to Avoid

First sentence contains a typo. "Materials outgas by three mechanisms: release of absorbed gases, release of adsorbed gases, and evaporation of the material itself."

The first mechanism is repeated "release of absorbed gases". It is unclear what the third mechanism of material outgassing should be as only two mechanisms are given. Does anyone know what the third mechanism for outgassing should be? Mcrodgers2 (talk) 18:26, 27 September 2018 (UTC) — Preceding unsigned comment added by Mcrodgers2 (talk • contribs) 21:29, 5 September 2018 (UTC)[reply]

Update: The sentence does NOT contain a typo. The three mechanisms are the release of aBsorbed gases, release of aDsorbed gases, and evaporation of the material itself, just as the sentence is written.

Nevertheless, the sentence could benefit from some clarification between the two sorption processes. I did notice the links to the two Wikipedia articles on Absorption and Adsorption. I prefer the link to the article on sorption which is more concise. Mcrodgers2 (talk) 21:24, 27 September 2018 (UTC)[reply]

Should the word "evaporation" above be replaced by sublimation, the transition from the solid phase directly to a gas? Should sublimation be added as a fourth mechanism, or not added at all? Mcrodgers2 (talk) 21:55, 27 September 2018 (UTC)[reply]

This article mentions 4 means of outgassing, Vapourisation, Desorption, Diffusion and Permeation: A Review of Outgassing and Methods for its Reduction

The Wikipedia article on Outgassing itself mentions 5 mechanisms.

I believe the two articles: "Materials for use in a vacuum" and "Outgassing" could be (and maybe should be) combined. Mcrodgers2 (talk) 22:15, 27 September 2018 (UTC)[reply]

Review of materials and issues to consider

Glasses and ceramics

Borosilicate glass is often used for smaller assemblies and for viewports. - (Define size of smaller assemblies)